24 CRUCIFERiE. (mustard FAMILY.) 



1. NASTURTIUM, H. IW. \Vater-Cbe88. 



Sili(|ue nearly tereU', linear or oblong, or siiort and silicic-like, usually 

 curved ui)\vard ; the valves nerveless. Seeds numerous, small, in two rows in 

 each cell, not marj^ined. Cotyledons accumbent. — Herbs. Leaves pinuately 

 lobed. Flowers white or yellow, small. 



* Petals yellow, minute (except No. 6). 



1. N. tanacetifolium, Hook. & Am. Stems diffuse, 6'- 12' long; 

 leaves bii)iuiiaiili(l, tlie lobes toothed ; silique oblong-linear, twice as long as 

 the pedicel. — Ditches and wet ground in the lower districts. May- June. 



•2. N. sessiliflorum, Nutt. Stem erect, branching, 10-2° high; leaves 

 obloiig-uhovate, jiiiiiiatilid towards the base, tuutlied above; silicjue linear- 

 oblong ; nearly sessile ; style short and thick. — Wet ground. South Carolina, 

 Tennessee, and westward. May -June. 



3. N. palustre, DC. Smooth or hairy ; stem erect, 1°- 3° high, branch- 

 ing; leaves i)iniiatifid, the lobes oblong, tootlied ; silicjue short, ovate or 

 oblong-ovate, barely half as long as the spreading pedicel ; style slender. — 

 "Wet ground, chiefly in the upper districts. 



4. N. obtUSUm, Nutt. Low and spreading ; leaves pinnatifid, the ob- 

 long or rounded lobes sparingly tootlied ; silicjue oblong, obtuse, twice as long 

 as the slender pedicel. — Banks of the Mississippi. 



5. N. limosutn, Nutt. "Very smooth; leaves lanceolate, laciniately 

 pinnatifid towards the base, nearly entire above, or angularly toothed, the 

 lobes serrate or entire ; pedicels much shorter than the short silique ; stigma 

 nearly sessile." — New Orleans (Nuttall). 



6. N. sylvestre, E. Br. Stem ascending ; leaves pinnately divided into 

 narrow toothed lo])es ; silique linear, mostly shorter than the slender pedicel ; 

 style very short ; petals yellow, longer than the calyx. — New Orleans. 

 Litroduced. 



* * Petals white, consjiicuous. 



7. N". oflSclnale, K. Br. (Water-Cress.) Stems spreading and root- 

 ing; leaves ]iinnate, the oblong or roundish lohes nearly entire ; .silique lin- 

 ear, curved, longer than the spreading pedicel. — Cool springs and branches. 

 Litroduced. 



8. N. lacustre, Gray. Aquatic; stem 2° -3° long; immersed leaves 

 pinnately divided into indefinite capillary segments, deciduous ; the emerged 

 ones oblong ; sili(iue obovate, shorter than the pedicel ; style shorter than the 

 ovary. — In a cool sjjring, Marianna, Florida, and New Orleans. Rare. 



2. CARDAMINE, L. 



Silique linear flattened, the valves veinless, usually opening elastically 

 from the base. Seeds wingless, disposed in a single row in each cell and sus- 

 pended by a filiform stalk. Cotyledons accumbent. — Tender, mostly smooth 

 herbs, with usually pinnately divided leaves, and white flowers. 



